What is spaced repetition?

On Memorang, spaced repetition is a feature that automatically selects what question or flashcard you will be quizzed on next based upon your previous right and wrong answers. Concepts you answer correctly will appear less often, whereas concepts that you're struggling with will show up more often. This helps you be ridiculously efficient with your studying and guarantees that you come away confident in your knowledge. You can read a bit more about it here.